I visited Stack Overflow consecutively for quite some time. I remember this day when I went home, and in the meantime I probably didn't visit SO for over 24 hours or so. But I did visit on Apr 5th 2014. Still SO didn't record that I visited that day.

3 Answers
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Stack Overflow days start and end at UTC 00:00. If you are not in Britain during wintertime, that's not ever your own timezone. Your midnight is not going to coincide with the site midnight. You can see the current time in UTC by looking at the achievements drop-down (the icon with the bars on it in the top-bar, click on that).

Merely logging in doesn't count as enough activity. What is considered enough is not public, but you need to do more than just look at the frontpage or your profile.

So depending on where you are in the world and whether or not you have daylight saving time you might find that visiting twice on the same local day is regarded as visits on consecutive UTC "days" while visits on consecutive local days is regarded as visits on the same UTC "day" or (annoyingly) visits on non consecutive UTC "days".